US media tycoon Michael Bloomberg has qualified for Wednesday's Democratic presidential debate, after a new poll shows him leapfrogging several of his rivals, including Joe Biden, to claim second spot in the race for the party nomination.Bloomberg's surge meant that he cleared a polling threshold set by the Democratic National Committee, placing the former New York mayor on stage to spar with fellow candidates, several of whom have launched broadsides against him, for the first time.The billionaire businessman who only jumped into the race in November, nearly a year after many of his rivals, earned 19% support nationally, second to leftist Bernie Sanders at 31 percent, in an NPR/PBS NewsHour/Marist survey.The moderate former vice president Biden came in third at 15% in the poll of some 1 400 registered voters, while progressive Senator Elizabeth Warren was at 12% and pragmatist Senator Amy Klobuchar at 9%."Mike is looking forward to joining the other Democratic candidates on stage and making the case for why he's the best candidate to defeat Donald Trump and unite the country," the Bloomberg campaign said Tuesday in a statement."The opportunity to discuss his workable and achievable plans for the challenges facing this country is an important part of the campaign process."Sharp criticism The 78-year-old Bloomberg, seen as a centrist, has been rising in the polls as he spends hundreds of millions of dollars of his vast personal fortune to blanket the airwaves with campaign ads.In the RealClearPolitics national poll average he has climbed into third spot, behind Sanders, also 78, and Biden, who is 77.More evidence of his momentum: he is coming under frequent attack from rivals - including Sanders, Biden and Pete Buttigieg - and from Trump himself.Sanders has repeatedly slammed Bloomberg for his attempt to "buy" his way into the presidential race, and by highlighting Bloomberg's absence on the campaign trail in early-voting states.Others have aimed sharp criticism at Bloomberg's past positions and comments that have been criticized as crude, racist or misogynistic.Wednesday's debate will be held in Las Vegas, three days ahead of Nevada's caucuses.Bloomberg is skipping the first four state contests to concentrate on so-called Super Tuesday on March 3, when 14 states vote on choosing a Democratic nominee.They include the most populous states California, where Bloomberg is polling fifth, and Texas, where he polls fourth.Bloomberg was a Democrat until he left the party in 2001.He served three terms as New York's mayor, first as a Republican, then as an independent. He re-registered as a Democrat in 2018.